Mesoamerican calendrical systems reached extraordinary sophistication, with the Aztec calendar representing one of humanity's most precise astronomical frameworks. The 365-day solar calendar aligned with Venus cycles in ways that wouldn't be rediscovered by Western astronomy for millennia. Iconographic analysis of recovered calendar stones reveals curious inconsistencies in facial depictions; certain stone carvings from late Aztec periods show deliberate erasure and re-carving of prominent figures. Epigrapher Dr. Mariana Cortés observed in 2001 that the photogrammetric evidence suggested one original face had been ground away entirely, then replaced with multiple versions over several decades. She theorized that the original visage displayed characteristics that caused widespread panic and religious crisis. Panic-based calendar replacement became shorthand in Aztec Studies circles for how civilizations respond to existential fear. Modern depictions of Aztec religious imagery often reference how frequently the dominant figure changed, a phenomenon otherwise unexplained by standard accounts of dynastic succession. The theory that something—or someone—so intimidating warranted systematic removal from all sacred calendars has gained traction among revisionist historians.